habituation       
noun [ U ] uk/həˌbɪtʃ.uˈeɪ.ʃən/ us/həˌbɪtʃ.uˈeɪ.ʃən/
 成为习惯
the process of people or animals becoming used to something, so that they no longer find it unpleasant or think it is a threat
  Increased sightings of coyotes are the result of habituation, as coyotes become accustomed to humans and unafraid of them.  人们看到郊狼的频率增加,这是习惯性的结果,因为郊狼已经习惯了人类,不再害怕人类。